I assumed that when using the hibatchi as a heat deflector, that they have it turned over with the flat side up.
To control the drippings, a fellow could use a pan with a rack in it for his product. This would make for an easier cleanup, and also have your product up and out of the drippings, and solve any of the drippings problem.
As far as a water pan, I guess you could use a foil bread pan and set it anywhere you wanted or had some extra room. I am not sure it would be needed.
Admittedly, I had not thought of that. That would explain why the foil is flat, in the video, when they use it as a deflector. But they clearly demonstrate the hibachi by sitting it flat on top of the charcoal chute to cook "fajitas, sausage, biscuits & gravy," etc. If I was concerned that having the hibachi sitting there would make it hard to maintain a 250º fire, I just don't see those eight little holes flowing enough air to keep a 500º fire going.
Please know that I am not "panning" this product. I know absolutely nothing about it. I've seen it discussed on two forums. But, as far as I can tell, no one in either location has actually seen one in action, and I couldn't find any actual reviews of the product.
I think at this point, Dave, I'm just going to fade into the background . . .
BD